safety - Catalogue (0860.1) - Wieland Electric

S4000
Basic device with time function – SNV 4274SL / SNV 4074ST
Applications
• Monitoring of limit values in the process industry
• Monitoring of emergency stop applications
• Monitoring of safety gates
• Monitoring of interlocks
• Monitoring of light barriers
• Up to PL e / Category 4 (EN ISO 13849-1)
• Up to SIL CL 3 (EN 62061)
Features
• Continuously adjustable, analog time setting
• Time ranges 3s, 30s or 300s
• Retriggering of the time delay possible
• Single-channel or two-channel control
• Manual or automatic start
• Cross monitoring
OFF-delay with retriggering function (SNV 4274SL)
After the supply voltage is applied to terminals A1/A2 and the safety inputs are
closed, the contacts are switched on immediately, either automatically or by pressing
the reset button (manual start). When the safety inputs are opened/de-energized,
the contacts are switched off immediately or with a release delay.
The set release delay only expires if the safety inputs are opened longer than the
release delay set on the device. If the safety inputs are closed again before the
release delay has expired (retriggering), the delayed contacts will remain closed, too.
ON-delay function (SNV 4074ST)
After the supply voltage is applied to terminals A1/A2 and the safety inputs are
closed, the contacts are switched on immediately or with a response delay, either
automatically or by pressing the reset button (manual start). When the safety
inputs are opened/de-energized the contacts are switched off immediately.
Circuit diagrams
SNV 4274SL
SNV 4074ST
66